Ferrihydrite/manganese
dioxide composites (FH–M) were synthesized
from ferrihydrite (FH) and manganese compounds by ex situ synthesis
and characterized using X-ray diffraction, scanning electron microscopy,
Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy
in the present work. The influences of experimental parameters such
as the solution pH value and initial concentration of adsorbate on
the adsorption uptake of Cd(II)/As(V) was systematically investigated.
The adsorption kinetics was analyzed by fitting quasi-first-order
and quasi-second-order kinetic equations. The results showed that
with increase in the pH value, the adsorption rate of Cd(II) is increased,
while that of As(V) is increased first and then decreased. For the
kinetic adsorption process, the adsorption performance of FH–M
to As(V) was better than that to Cd(II). The quasi-second-order kinetic
equation and Freundlich equation were more suitable to describe the
adsorption of Cd(II)/As(V). The ligand exchange of Cd(II)/As(V) with
the −OH in the composites was confirmed by analyzing the characterization
results of X-ray photoelectron spectroscopy and Fourier transform
infrared spectroscopy. The high adsorption ability of the FH–M
makes it a potentially attractive adsorbent for the removal to Cd(II)
and As(V) with a good application prospect.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.